batgrbproduct Analysis for Trigger=518792
Analysis Summary
Notes:
- 1) No attempt has been made to eliminate the non-significant decimal places.
- 2) This batgrbproduct analysis is done of the amount of data for this trigger downloaded to date.
- 3) This batgrbproduct analysis is using the flight position for the mask-weighting calculation.
- 4) This page will be updated for up to 10 downlinks after the trigger.
======================================================================
BAT GRB EVENT DATA PROCESSING REPORT
Process Script Ver: batgrbproduct v2.46
Process Start Time (local time): Wed Mar 28 12:14:45 EDT 2012
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger518792/GCN5_download_cron
======================================================================
Trigger: 00518792 Segment: 000
BAT Trigger Time: 354596787.072 [s; MET]
Trigger Stop: 354596788.48 [s; MET]
UTC: 2012-03-28T03:06:19.032840 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 241.549796791991 Dec: -39.3402511024914 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 6.57
Image Trigger?: NO
Rate S/N Ratio: 13.1909059582729 [ if not an image trigger ]
Image S/N Ratio: 6.57
Flight Position: [ source = BAT ]
RA: 241.549796791991 Dec: -39.3402511024914 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 241.607527845859 Dec: -39.3224849165837 [deg; J2000]
{ 16h 06m 25.8s , -39d 19' 20.9" }
+/- 1.77400877399045 [arcmin] (estimated 90% radius based on SNR)
+/- 0.729268120563321 [arcmin] (formal 1-sigma fit error)
SNR: 13.4111891973426
Angular difference between Flight and Ground position is 2.883541 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 24.1719999909401 +/- 6.76263765547588
Measured from: -15.9039999246597
to: 8.26800006628036 [s; relative to TRIGTIME]
T50: 12.3599999547005 +/- 2.96982153933694
Measured from: -10.8999999165535
to: 1.46000003814697 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.107999980449677
to: 1.10799998044968 [s; relative to TRIGTIME]
Total Fluence
Measured from: -17.272000014782
to: 20.6119999885559 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.300645 0.385908 0.185568 0.065618
0.038048 0.033101 0.027731 0.023923 [error]
Peak 0.028897 0.031704 0.032004 0.006989
0.006375 0.005851 0.004905 0.004076 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
=== Fluence/Peak Flux Summary ===
Model Band1 Band2 Band3 Band4 Band5 Total
15-25 25-50 50-100 100-350 15-150 15-350 keV
Fluence Power-law 9.32e-08 1.37e-07 1.50e-07 3.07e-07 4.74e-07 6.87e-07 erg/cm2
Error 1.52e-08 1.49e-08 2.58e-08 1.07e-07 6.02e-08 1.33e-07 erg/cm2
Peak flux Power-law 2.26e-01 2.42e-01 1.83e-01 2.26e-01 7.37e-01 8.78e-01 ph/cm2/s
Error 7.52e-02 4.81e-02 4.00e-02 1.06e-01 1.35e-01 1.58e-01 ph/cm2/s
Fluence Cutoff-PL 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Error 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Peak flux Cutoff-PL 2.21e-01 2.44e-01 1.85e-01 2.00e-01 7.33e-01 8.49e-01 ph/cm2/s
Error 8.69e-02 5.15e-02 4.42e-02 1.73e-01 1.40e-01 2.01e-01 ph/cm2/s
Fluence Band 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Error 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Peak flux Band 8.26e-01 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 ph/cm2/s
Error 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.870 0.198 - - 1.36e-03 1.72e-04 78.270 57
CPL 0.873 1.055 46.2 35.3 5.17e-03 1.31e-02 74.840 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.400 0.326 - - 6.06e-03 1.07e-03 63.110 57
CPL 1.180 0.000 199.7 0.0 7.70e-03 0.00e+00 63.110 56
Model : spectral model: simple power-law (PL) and cutoff power-law (CPL)
Ph_index : photon index: E^-{Ph_index} (minus sign is not included in the index)
Ph_90err : 90% error of the photon index
Epeak : Epeak in keV
Epeak_90err: 90% error of Epeak
Norm : normalization at 50 keV in PL model and at 1 keV in CPL model
Nomr_90err : 90% error of the normalization
chi2 : Chi-Squared
dof : degree of freedom
=== T90/T50 calculation in the 50-300 keV band (BATSE band) using 64 ms lc ===
T90 in the 50-300 keV band: 18.624000 sec.
T50 in the 50-300 keV band: 13.760000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 37.884 -17.272 20.612
T90 24.172 -15.904 8.268
T50 12.360 -10.900 1.460
Peak 1.000 0.108 1.108
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
241.6075 -39.3225 0.0144 10.8 2.1 0.9223 13.4 TRIG_00518792
------------------------------------------
Foreground time interval of the image:
-17.272 20.612 (delta_t = 37.884 [sec])
Background time interval of the image:
-239.072 -17.272 (delta_t = 221.800 [sec])
Lightcurves
Notes:
- 1) All plots contain as much data as has been downloaded to date.
- 2) The mask-weighted light curves are using the flight position.
- 3) Multiple plots of different time binning/intervals are shown to cover all scenarios of short/long GRBs, rate/image triggers, and real/false positives.
- 4) For all the mask-weighted lightcurves, the y-axis units are counts/sec/det where a det is 0.4 x 0.4 = 0.16 sq cm.
- 5) The verticle lines correspond to following: green dotted lines are T50 interval, black dotted lines are T90 interval, blue solid line(s) is a spacecraft slew start time, and orange solid line(s) is a spacecraft slew end time.
- 6) Time of each bin is in the middle of the bin.
1 s binning
From T0-310 s to T0+310 s
From T100_start - 20 s to T100_end + 30 s
Full time interval
64 ms binning
Full time interval
From T100_start to T100_end
From T0-5 sec to T0+5 sec
16 ms binning
From T100_start-5 s to T100_start+5 s
8 ms binning
From T100_start-3 s to T100_start+3 s
2 ms binning
From T100_start-1 s to T100_start+1 s
SN=5 or 10 sec. binning (whichever binning is satisfied first)
SN=5 or 10 sec. binning (T < 200 sec)
Spectra
Notes:
- 1) The fitting includes the systematic errors.
- 2) For long bursts, a spectral fit of the pre-slew DRM will introduce some errors in both a spectral shape and a normalization if the PHA file contains a lot of the slew/post-slew time interval.
- 3) For fits to more complicated models (e.g. a power-law over a cutoff power-law), the BAT team has decided to require a chi-square improvement of more than 6 for each extra dof.
- 4) For short bursts (T90<1sec), the specrtum is also fit with Blackbody, OTTB, and Double Blackbody.
Time averaged spectrum fit using the pre-slew DRM
Power-law model
Time interval is from -17.272 sec. to 20.612 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.87027 ( -0.19467 0.200961 )
Norm@50keV : 1.36045E-03 ( -0.00017384 0.000171012 )
------------------------------------------------------------
# Chi-Squared = 78.27 using 59 PHA bins.
# Reduced chi-squared = 1.373 for 57 degrees of freedom
# Null hypothesis probability = 3.228863e-02
Photon flux (15-150 keV) in 37.88 sec: 0.192821 ( -0.0211978 0.0212191 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.73758e-07 ( -5.95799e-08 6.07902e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -17.272 sec. to 20.612 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.873244 ( -1.18867 0.921199 )
Epeak [keV] : 46.1752 ( -10.3005 60.26 )
Norm@50keV : 5.17116E-03 ( -0.00517396 0.0209944 )
------------------------------------------------------------
# Chi-Squared = 74.84 using 59 PHA bins.
# Reduced chi-squared = 1.336 for 56 degrees of freedom
# Null hypothesis probability = 4.708985e-02
Photon flux (15-150 keV) in 37.88 sec: 0.184639 ( -0.022344 0.022446 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Band function
Time interval is from -17.272 sec. to 20.612 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 2.49110 ( -2.05561 -1.20171 )
beta : -2.33243 ( -0.488638 0.375452 )
Epeak [keV] : 31.3654 ( -7.53183 9.19358 )
Norm@50keV : 1.16904 ( -1.12077 29.2985 )
------------------------------------------------------------
# Chi-Squared = 71.08 using 59 PHA bins.
# Reduced chi-squared = 1.292 for 55 degrees of freedom
# Null hypothesis probability = 7.112415e-02
Photon flux (15-150 keV) in 37.88 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 10.2284 (-1.22235 1.43019)
R^2/D10^2 : 8.33471E-02 (-0.0330873 0.0530795)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 84.09 using 59 PHA bins.
# Reduced chi-squared = 1.475 for 57 degrees of freedom
# Null hypothesis probability = 1.130936e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.776e-08 1.320e-08
25- 50 1.739e-07 2.307e-08
50-150 9.685e-08 2.868e-08
15-150 3.385e-07 4.798e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 78.1291 (-23.3171 43.5012)
Norm : 0.915424 (-0.143831 0.182348)
------------------------------------------------------------
# Chi-Squared = 75.28 using 59 PHA bins.
# Reduced chi-squared = 1.321 for 57 degrees of freedom
# Null hypothesis probability = 5.279122e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.984e-08 1.438e-08
25- 50 1.470e-07 1.881e-08
50-150 2.043e-07 8.460e-08
15-150 4.411e-07 8.148e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.30161 (-1.90578 2.26311)
R1^2/D10^2 : 0.228279 (-0.103798 0.207397)
kT2 [keV] : 23.9236 (-9.75722 -24.3624)
R2^2/D10^2 : 1.94351E-03 (-0.00182783 0.00535833)
------------------------------------------------------------
# Chi-Squared = 72.03 using 59 PHA bins.
# Reduced chi-squared = 1.310 for 55 degrees of freedom
# Null hypothesis probability = 6.142278e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.470e-08 3.656e-08
25- 50 1.561e-07 7.579e-08
50-150 1.992e-07 1.098e-07
15-150 4.400e-07 1.910e-07
Peak spectrum fit
Power-law model
Time interval is from 0.108 sec. to 1.108 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.39989 ( -0.325854 0.325558 )
Norm@50keV : 6.05529E-03 ( -0.00107493 0.00107096 )
------------------------------------------------------------
# Chi-Squared = 63.11 using 59 PHA bins.
# Reduced chi-squared = 1.107 for 57 degrees of freedom
# Null hypothesis probability = 2.693438e-01
Photon flux (15-150 keV) in 1 sec: 0.737404 ( -0.134143 0.134971 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.8511e-08 ( -1.14123e-08 1.15896e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.108 sec. to 1.108 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.17962 ( )
Epeak [keV] : 199.745 ( )
Norm@50keV : 7.70351E-03 ( )
------------------------------------------------------------
# Chi-Squared = 63.11 using 59 PHA bins.
# Reduced chi-squared = 1.127 for 56 degrees of freedom
# Null hypothesis probability = 2.396607e-01
Photon flux (15-150 keV) in 1 sec: 0.732902 ( -0.141301 0.137903 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.00301e-07 ( -4.70558e-08 5.1878e-08 ) ergs/cm2
Band function
Time interval is from 0.108 sec. to 1.108 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.21529 ( 1.21586 0.941146 )
beta : -9.37165 ( 9.99998 20 )
Epeak [keV] : 235.100 ( -235.355 -235.355 )
Norm@50keV : 7.36588E-03 ( -0.00236044 0.00911655 )
------------------------------------------------------------
# Chi-Squared = 63.09 using 59 PHA bins.
# Reduced chi-squared = 1.147 for 55 degrees of freedom
# Null hypothesis probability = 2.120365e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 18.6741 (-4.05216 5.30293)
R^2/D10^2 : 3.95901E-02 (-0.0223712 0.0511276)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 71.26 using 59 PHA bins.
# Reduced chi-squared = 1.250 for 57 degrees of freedom
# Null hypothesis probability = 9.684978e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.730e-09 1.239e-09
25- 50 1.297e-08 4.772e-09
50-150 3.313e-08 1.151e-08
15-150 4.883e-08 1.467e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.361 (-85.0307 -199.871)
Norm : 3.04444 (-0.536405 0.537873)
------------------------------------------------------------
# Chi-Squared = 63.95 using 59 PHA bins.
# Reduced chi-squared = 1.122 for 57 degrees of freedom
# Null hypothesis probability = 2.458233e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.581e-09 4.168e-09
25- 50 1.458e-08 7.950e-09
50-150 3.198e-08 1.786e-08
15-150 5.415e-08 2.999e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.56266 (-2.30041 2.94722)
R1^2/D10^2 : 1.69157 (-1.3971 6.26359)
kT2 [keV] : 26.0379 (-6.91206 14.3318)
R2^2/D10^2 : 1.14220E-02 (-0.00867071 0.0160815)
------------------------------------------------------------
# Chi-Squared = 61.00 using 59 PHA bins.
# Reduced chi-squared = 1.109 for 55 degrees of freedom
# Null hypothesis probability = 2.691604e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.503e-09 4.344e-09
25- 50 1.283e-08 6.935e-09
50-150 3.838e-08 2.321e-08
15-150 5.871e-08 3.172e-08
Plot creation:
Wed Mar 28 12:29:48 EDT 2012